1213221198 has 32 divisors (see below), whose sum is σ = 2825404416. Its totient is φ = 340093728.

The previous prime is 1213221169. The next prime is 1213221203. The reversal of 1213221198 is 8911223121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270286 + ... + 274737.

It is an arithmetic number, because the mean of its divisors is an integer number (88293888).

Almost surely, 2^1213221198 is an apocalyptic number.

1213221198 is an abundant number, since it is smaller than the sum of its proper divisors (1612183218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213221198 is a wasteful number, since it uses less digits than its factorization.

1213221198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545088.

The product of its digits is 1728, while the sum is 30.

The square root of 1213221198 is about 34831.3249532658. The cubic root of 1213221198 is about 1066.5469955371.

The spelling of 1213221198 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, one hundred ninety-eight".